Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['P', 'F', '9221', '4813', 'q', 'Q', 'F']

16, 6, 9221, 4813, 17, 17, 6